JP4241866B2 - Image recording apparatus and image recording method - Google Patents

Description

  The present invention relates to an image recording apparatus capable of performing automatic focus adjustment as necessary when performing moving image recording or still image recording.

  In recent years, in the field of magnetic recording, the demand for high-density recording has increased, and even in a video tape recorder (VTR), the tape traveling speed has been reduced to perform higher-density magnetic recording.

  When the tape traveling speed decreases, for example, when an audio signal is recorded using a fixed head, the relative speed cannot be increased and the reproduction sound quality deteriorates. As one means for solving this, there is a method in which the length of a track scanned by a rotary head is made longer than before, and audio signals compressed in time axis are sequentially recorded in the extended portion.

  Specifically, in the rotary two-head helical scan type VTR, the magnetic tape is wound around the rotating cylinder by 180 degrees or more, whereas in this method, the rotating cylinder is wound by (180 + θ) degrees or more and is wound extra. This is a method of recording an audio signal that has been converted to PCM and time-axis-compressed in the portion θ ″.

  FIG. 7 is a diagram showing a tape running system of such a VTR, and FIG. 8 is a diagram showing a recording locus on the magnetic tape by the VTR shown in FIG. Here, 71 is a magnetic tape, 72 is a rotating cylinder, 73 and 74 are heads attached to the cylinder 72, 75 is a video signal recording area portion of a track formed on the tape 71, and 76 is a PCM audio signal recording area. Part. The video area 75 is traced by the heads 73 and 74 at 180 degrees of the rotating cylinder 72, and the PCM area 76 is traced at θ of the rotating cylinder 72.

  As described above, as an example of applying a method of recording a digital signal in another area while recording a video signal, it has been proposed to record a still image as a digital signal in the digital signal (PCM) recording area. ing. That is, since the amount of information is small if it is a still image, it is possible to record all the information on the magnetic tape by scanning the PCM area a plurality of times. According to this method, not only can the still image shooting be performed using the same shooting apparatus and the same recording medium as the moving image shooting, but also the tape running is stopped and the video signal of the same track is obtained as in the conventional VTR. It is possible to obtain a still image with higher image quality than a still image to be reproduced.

  When performing moving image recording and still image recording as described above, automatic focus adjustment control (hereinafter simply referred to as AF) is included as a function of various devices as an indispensable technique.

  However, since AF always measures the distance, it operates delicately not only at the time of large blur but also in the vicinity of the focal point. Also, unexpected AF operations may occur due to subject movement or camera shake of the photographer. As a result, the focus of the subject that was about to be recorded is unexpectedly blurred, or the focus position is not appropriate. Inconvenience can occur.

Furthermore, when shooting, if the AF operation is stopped, or if it is desired to appropriately select prohibition / execution of AF, it must be performed in parallel with the original operation for image recording. Therefore, the following drawbacks are observed.
(1) Depending on the time required for the operation for instructing prohibition or execution of AF, the photographing opportunity may be missed.
(2) Since a switch for instructing prohibition / execution of AF must be searched and pressed, it is necessary to keep an eye on the viewfinder, which not only takes time and effort, but also misses the subject image in the viewfinder. End up.
(3) There is a case where the switch is searched and pushed while looking at the finder without performing as in the above (2), and a wrong operation may occur due to contact with another switch and its activation.
(4) It may cause camera shake due to switch operation or vibration of the switch itself.

  These drawbacks described above significantly impair the role as an image recording apparatus.

  Therefore, in view of the above-described points, the object of the present invention is to provide an image recording apparatus that improves operability while performing automatic focus adjustment in accordance with the recording mode, on the premise of having a moving image recording mode and a still image recording mode. It is to provide an image recording method.

  To achieve the above object, the present invention according to claim 1 has a moving image recording mode and a still image recording mode, and mode switching means for switching between the moving image recording mode and the still image recording mode; An image recording apparatus comprising a trigger switch for performing a focus adjustment instruction and an image recording instruction, wherein the image recording instruction by the trigger switch becomes a moving image recording instruction or a still image recording instruction in accordance with switching of the mode switching means. In the still image recording mode, the auto focus adjustment operation is executed by half-pressing the trigger switch. In the moving image recording mode, the auto focus adjustment function is executed by half-pressing the trigger switch. It is characterized by not.

  According to a second aspect of the present invention, in the image recording apparatus according to the first aspect, the image recording records a still image with a digital signal.

  According to a third aspect of the present invention, in the image recording device according to any one of the first to second aspects, the image recording records a moving image by a television signal.

  According to a fourth aspect of the present invention, there is provided an image recording method having a moving image recording mode and a still image recording mode, wherein a mode switching step for switching between the moving image recording mode and the still image recording mode is performed. The instruction is a moving image recording instruction or a still image recording instruction in accordance with the switching in the mode switching step, and in the still image recording mode, an automatic focus adjustment operation is executed by half-pressing the trigger switch, and the moving image recording is performed. In the mode, the automatic focus adjustment function is not performed by half-pressing the trigger switch.

  According to the present invention, the image recording instruction by the trigger switch becomes a moving image recording instruction or a still image recording instruction according to the switching of the recording mode, and the automatic focus adjustment operation execution by the trigger switch is switched at the mode switching step. Since the configuration is changed accordingly, it is possible to improve operability while performing automatic focus adjustment on the premise of having a moving image recording mode and a still image recording mode corresponding to the recording mode.

Hereinafter, each embodiment of the present invention will be described in detail.
(Embodiment 1)
FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. The configuration shown in this figure is a hardware configuration common to Embodiments 1 to 4 described in detail below.

  In FIG. 1, reference numeral 101 denotes a photographing lens system, which includes a focusing lens for performing focus adjustment. Reference numeral 102 denotes an iris that controls the amount of incident light. Reference numeral 103 denotes an image sensor such as a CCD that photoelectrically converts a subject image formed on the imaging surface by the focusing lens 101 to convert it into an image signal.

  Reference numeral 104 denotes a sample / hold circuit, 105 denotes a camera signal processing circuit that converts a predetermined television signal, 106 denotes a video signal processing circuit that outputs a moving image recording (MV) signal, and 107 performs A / D conversion on the television signal. A / D conversion circuit, 108 is a rate conversion circuit that compresses an A / D converted digital television signal, 109 is a PCM conversion circuit that outputs a PCM-converted still image recording (SV) signal, and 110 is a recording circuit It is.

  Reference numeral 111 denotes an in-focus detection circuit for detecting the in-focus state of the subject by, for example, extracting a high frequency component from the video signal output from the camera signal processing circuit 105. Reference numeral 112 denotes an SV / MV mode switch for setting whether the recording method is still image recording (SV) or moving image recording (MV). Reference numeral 113 denotes a two-stage trigger switch (hereinafter simply referred to as “trigger”) for performing both an AF permission / prohibition instruction and a recording instruction.

  114 outputs a focus control command from the output of the focus detection circuit 111, designates a recording method from the output of the SV / MV mode changeover switch 112, and starts from the output of the trigger 113 (open / half-press / full-press). It is a control circuit that controls execution of recording and permission / prohibition of AF. Reference numeral 115 denotes a drive motor that executes commands such as the rotation direction, rotation speed, and rotation / stop of the focusing lens 101 in accordance with a focus control command from the control circuit 114.

  FIG. 2 shows a control flow in the SV mode. First, in step S1, it is determined whether or not the recording mode is the SV mode. If it is SV mode, it will be determined whether a trigger is open | released in step S2. If it is open, AF is executed in step S3, and if not open, it is determined in step S4 whether the trigger is half-pressed. If the trigger is not half pressed, it is determined in step S5 whether the trigger is fully pressed. When the button is fully pressed, AF is prohibited in step S8, a subject on the imaging screen is captured in step S9, and a still image is recorded by performing the above-described A / D, rate, and PCM conversion.

  If the trigger is not fully depressed, the process returns to step S3 and AF is executed (at this time, the trigger is in an open state).

  If the trigger is half-pressed in step S4, AF is prohibited in step S7. In step S8, it is determined whether or not the trigger is fully pressed. If not, the process returns to step S2 to determine whether or not the trigger is released. If the trigger is fully pressed, AF is prohibited in step S6, a subject on the imaging screen is captured in step S9, and a still image is recorded as described above.

  FIG. 3 shows a control procedure when the recording mode is the MV mode. In step S11, it is determined whether or not the recording mode is the MV mode. If it is the MV mode, it is determined in step S12 whether or not the trigger is released. If it is open, AF is executed in step S13, and if not open, it is determined in step S14 whether the trigger is half-pressed.

  If the trigger is not half pressed, it is determined in step S15 whether the trigger is fully pressed. When the button is fully pressed, AF is executed in step S16, and in step S19, the subject on the imaging screen is subjected to the video signal processing described above and recorded as a moving image.

  If the trigger is not fully pressed, the process returns to step S13 to execute AF (at this time, the trigger is in an open state). If the trigger is half-pressed in step S14, AF is prohibited in step S17. In step S18, it is determined whether or not the trigger is fully pressed. If not, the process returns to step S12 to determine whether or not the trigger is released.

  If the trigger is fully pressed, AF is executed in step S16, and the subject on the imaging screen is recorded as a moving image in step S19.

  During recording, if the trigger is half-pressed in step S20, AF is prohibited in step S21. If not half-pressed, it is determined in step S22 whether or not the trigger is released. If it is open, the process returns to step S16 to execute AF, and recording is performed in step S19.

  If not released, it is determined in step S23 whether or not the trigger is fully pressed again. If not fully pressed, recording is performed as it is. If it is fully pressed, recording is stopped in step S24.

  FIG. 4 is a flowchart of chattering prevention for detecting a half-pressed state of the trigger. Note that the flow is not limited to half-pressing of the trigger, and the same flow applies to other states of the trigger.

  If it is determined in step S31 that the trigger is half-pressed, the timer in step S32 is started, and the time is measured until the timer ends in step S33. The sensitivity for reading the half-pressed state of the trigger is determined by this time. This time is not the same in both the SV mode and the MV mode. For example, it is short in the SV mode and the half-pressed state is sensitively read. In consideration of this, it can be taken longer, and it may be set in accordance with each mode and control function.

If it is in the half-pressed state after the timer time has elapsed in step S34, the trigger half-pressed state is detected in step S35.
(Embodiment 2)
In the SV mode, as in the first embodiment, it is not always necessary to execute AF when the two-step trigger is opened, and prohibit AF when pressed halfway.

  Therefore, in the second embodiment described in detail below, as shown in FIG. 5, AF is prohibited when the two-stage trigger is opened, and AF is performed when the half-press is half-pressed. First, in step S41, it is determined whether or not the recording mode is the SV mode. If it is SV mode, it will be determined whether a trigger is open | released in step S42. If open, AF is prohibited in step S43, and if not open, it is determined in step S44 whether the trigger is half-pressed.

  If the trigger is not half pressed, it is determined in step S45 whether the trigger is fully pressed. When the button is fully pressed, AF is prohibited in step S46, the subject on the imaging screen is captured in step S49, and still image recording is performed by performing the above-described A / D conversion, rate conversion, and PCM conversion.

  If the trigger is not fully pressed, the process returns to step S43 and AF is prohibited (at this time, the trigger is in an open state).

  When the trigger is half-pressed in step S44, AF is executed in step S47. In step S48, it is determined whether or not the trigger is fully pressed. If not, the process returns to step S42 to determine whether or not the trigger is released.

If the trigger is fully pressed, AF is prohibited in step S46, and the subject on the imaging screen is captured in step S49 and still image recording is performed.
(Embodiment 3)
When the recording mode is set to the MV mode, AF execution and prohibition when recording is performed (that is, when the trigger full-press state is turned on) are the AF states up to that point (trigger release, half-press state) It is also possible to configure to follow.

  Therefore, in the third embodiment, as shown in FIG. 6, it is first determined in step S51 whether or not the recording mode is the MV mode. If it is the MV mode, it is determined in step S52 whether or not the trigger is released. If it is open, AF is executed in step S53, and if not open, it is determined in step S54 whether the trigger is half-pressed.

  If the trigger is not half pressed, it is determined in step S55 whether the trigger is fully pressed. When fully depressed, moving image recording is performed in step S56. If the trigger is not fully pressed, the process returns to step S53, and AF is executed (at this time, the trigger is in an open state).

  If the trigger is half-pressed in step S54, AF is prohibited in step S57. In step S58, it is determined whether or not the trigger is fully pressed. If not, the process returns to step S52 to determine whether or not the trigger is released. If the trigger is fully pressed, moving image recording is performed in step S56 while AF is prohibited.

During recording, if the trigger is half-pressed in step S59, AF is prohibited in step S60. If not half-pressed, it is determined in step S61 whether the trigger is released. If not open, the process returns to step S56 to record a moving image, and if open, AF is executed in step S62. Next, in step S63, it is determined whether or not the trigger is fully pressed again. If not fully pressed, recording is performed as it is. If it is fully pressed, recording is stopped in step S64.
(Embodiment 4)
When the MV mode is set as the recording mode, there is no function in the half-pressed state of the two-stage trigger (that is, it functions as a one-stage trigger switch). Accordingly, in the fourth embodiment, recording is performed without having the function of executing / prohibiting AF by opening the trigger and fully pressing the trigger.

  The present invention can be used for an image recording apparatus that can perform automatic focus adjustment as necessary when performing moving image recording or still image recording.

1 is a block configuration diagram showing an entire embodiment of the present invention. 3 is a flowchart illustrating a control procedure in a still image recording (SV) mode according to the first embodiment. It is a flowchart which shows the control procedure at the time of the moving image recording (MV) mode in 1st Embodiment. It is a flowchart for detecting the half-pressed state of the two-stage trigger switch. It is a flowchart which shows the 2nd Embodiment of this invention. It is a flowchart which shows the 3rd Embodiment of this invention. It is explanatory drawing of the rotary head by a prior art. It is a figure which shows the recording locus | trajectory on the magnetic tape by a prior art.

Explanation of symbols

101 Shooting lens system (focusing lens)
102 Aperture 103 Image sensor 104 Sample / hold circuit 105 Camera signal processing circuit 106 Video signal processing circuit 107 A / D conversion circuit 108 Rate conversion circuit 109 PCM conversion circuit 110 Recording circuit 111 Focus detection circuit 112 SV, MV mode changeover switch 113 Two-stage trigger switch 114 Control circuit 115 Drive motor

Claims (4)

Image recording apparatus having a moving image recording mode and a still image recording mode, comprising: mode switching means for switching between the moving image recording mode and the still image recording mode; and a trigger switch for performing an automatic focus adjustment instruction and an image recording instruction Because
The image recording instruction by the trigger switch becomes a moving image recording instruction or a still image recording instruction according to the switching of the mode switching means, and in the still image recording mode, the automatic focus adjustment operation is performed by half-pressing the trigger switch. An image recording apparatus that is executed and has no function of executing an automatic focus adjustment function when the trigger switch is half-pressed in the moving image recording mode. The image recording apparatus according to claim 1,
The image recording apparatus is characterized in that the image recording records a still image with a digital signal. The image recording apparatus according to claim 1,
The image recording apparatus according to claim 1, wherein the image recording records a moving image by a television signal. In an image recording method having a moving image recording mode and a still image recording mode, and performing a mode switching step of switching between the moving image recording mode and the still image recording mode,
The image recording instruction by the trigger switch becomes a moving image recording instruction or a still image recording instruction according to the switching in the mode switching step, and in the still image recording mode, the auto focus adjustment operation is executed by half-pressing the trigger switch. In the moving image recording mode, the image recording method is characterized by having no function of executing the automatic focus adjustment function by half-pressing the trigger switch.

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